<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/image/index_2.jpg" alt="">
      </div>
      <!-- 登录表单区域 -->
      <el-form ref="loginFormRef" :model="loginform" class="login_form" :rules="loginFormRules">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginform.username" prefix-icon="el-icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginform.password" type="password" prefix-icon="el-icon-lock"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data () {
    return {
      loginform: {
        username: 'admin',
        password: '123456'
      },
      // 表单的验证规则对象
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid);
        if (!valid) return;
        const { data: res } = await this.$http.post('login', this.loginform)
        //  console.log(res);
        if (res.meta.status !== 200) return this.$message.error('登陆失败')
        this.$message.success('登陆成功')
        //1.将登陆成功之后的token，保存到客户端的sessionStorage中
        //1.1项目中出了登陆之外的其它API接口，必须在登陆之后才能访问
        //1.2token只应在当前网站打开期间生效吗，所以讲token保存在sessionStore中
        window.sessionStorage.setItem('token', res.data.token)
        //2.通过编程式导航跳转到后天主页，路由地址是/home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style scoped>
.login_container {
  height: 100%;
  background-color: #2b4b6b;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  margin: 0 auto;
  position: relative;
  top: 25%;
}
.avatar_box {
  width: 150px;
  height: 150px;
  margin: 0 auto;
  position: relative;
  top: -25%;
  border-radius: 50%;
  box-shadow: 0 0 20px #ddd;
}
.avatar_box img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
}
.login_form {
  margin-top: -40px;
  width: 100%;
  height: 100%;
  padding: 0 100px;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: space-around;
}
</style>

